If you are lucky, and your slide is set up just right, you can do this with one trigger, using the clicks outside action.

For example: you could create a slide with a large invisible object 5 covering the whole slide. Then place objects 1, 2, 3, 4 above it. then write the trigger to change state if user clicks outside object 5. The only way to click outside object 5 would be to click on one of the other 4.

But in a larger sense, why would you do it? That design would prevent any other interaction on that slide, and would be, in my mind, unnecessary complexity. I would create the 4 objects, write the trigger for object 1. Then copy the trigger, select object 2, and paste the trigger. It will be copied, and the target will be changed from "clicks object 1" to clicks object 2". One copy is all you need, then it is merely - click to select object, click to paste trigger. Much faster to create, much, much easier to maintain or change, and doesn't interfere with any other interactions on the slide.